<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    function arr(s) {
      const hash = {};
      //记录每个字母的最远位置
      for (let i = 0; i < s.length; i++) {
        hash[s[i]] = i;
      }
      const result = [];
      let left = 0, right = 0;
      //找分割点
      for (let i = 0; i < s.length; i++) {
        right = Math.max(right, hash[s[i]]);
        if (right === i) {
          result.push(right - left + 1);
          left = i + 1;
        }
      }
      return result;
    };
    console.log(arr("ababcbacadefegdehijhklij"));
  </script>
</body>

</html>